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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 17 |
| 3 | 64 |
| 4 | 512 |
| 5 | 2176 |
| 6 | 52784 |
| 7 | 242176 |
| 8 | 22205984 |
| 9 | 103942144 |
| 10 | 39954751040 |
| 11 | 183158185984 |
| 12 | 304199179800704 |
| 13 | 1345426301157376 |
| 14 | 9591893861120254208 |
| 15 | 41024530124682428416 |
| 16 | 1232880451618561434845696 |
[4,17,64,512,2176,52784,242176,22205984,103942144, 39954751040,183158185984,304199179800704, 1345426301157376,9591893861120254208, 41024530124682428416,1232880451618561434845696] |